CEPHALOPODA PROM THE HOKKAIDO. 



27 



as L. Juhesi Sharpe ? and afterward under the name of L. 

 denmanense sp. nov. and considered to be identical with G. Kayei 

 by KossMAT, is believed by the writer to be a distinct species, 

 he in this respect agreeing with the latest view of Whiteaves. 



Localities: — The Kikumezawa, a tributary of the Ikushumbets, 

 and the upper course of the latter ; one from each locality. 



Horizon : — Pachydiscus-heds. 



II. Varieties with a Narrower Umbilicus and Coarser Ribs. 



Var. intermedia, m. 



PL III., figs. 1 a, b. 



1895. Lytoceras Sacya Jimbo : 1. c. p. 34 (180), PI. 



VI. fig. 1. 

 1895. Lytoceras denseplicatum var. Jimbo : 1. c. p. oG (182). 

 Dimentions : — 



(1) K.,i.,. 



Diameter. ■ 3.1 cm. 



Height of the last whorl. : 1.3 „ 



l^reacUh of the last whurl. ■ 1.3 „ 



Width of umliilicus. , 1.05 ,, 



100. 

 41. 

 41. 



("/ Katiii. 



3.40 cm. 

 1.45 „ 

 1.50 „ 

 1.10 „ 



100. 

 42. 

 44. 

 32. 



(•^) llati 



4.1 cm. 

 1.8 „ 

 1.5 „ 

 1.3 „ 



100. 

 43. 

 31). 

 30. 



(^) Ka, 



11.7 cm. 

 5.7 „ 

 5.3 „ 

 3.0 „ 



100. 

 48. 

 45. 

 25. 



1) A specimen from the Yfibarigawa, Prov. Ishikari. 



2) The original of Jimbô's PI. VI. fig. 1 ; loc. Yübarigawa. 



3) A specimen from the Penke-moyübari. 



4) A specimen from the Sanushibe, Prov. Iburi. 



This variety is distinguished from the normal form by the 

 following characters : — 



When yoiuig, the whoi-ls grow more rapidly in height ; the 

 umbilicus is narrower and somewhat deeper, a little more than 



